unsafe stair treads

I have put polyurethane on new oak stair treads and they are very slippery.
Is there a better product to prevent this as a solution to this problem?

 

Now that the wood is protected, how about installing a carpet runner down the center? It is a classy look with shiny oak!

 

Bump to top for more ideas for stairtread traction!

 

:agree: carpets will fix the slippery aspect